Tube-welding machine



(N o Mode l T. H. ROBERTS. v TUBE WELDING MAUHINE.

N0.;Z84,3Z9'." Patented Sept. 4, 188.3.

INITED STATES PATENT ()FFICE.

-THOMAS H. nonnnrs, or PORT HURON, MICHIGAN.

TUBE-WELDING MACHIN E SPECIFICATION formingpart of Letters Patent No.284,329, dated E eptember 4, 1883.

Application filed December 23, 1882. (No model.)

, chines, and is especially designed as an im provement upon the devicepatented to me in the Patent No. 211, 589, dated January 21, 187 9. Myinvention especially consists in the mandrel attachment to be used inconnection with power-hammers for the purpose of welding metallic tubes,by means of which such mandrel is more conveniently operated, as morefully hereinafter described.

In the accompanying drawing, which forms a part of this specification aperspective View of my improvement is shown in connection with thehammers. i

A represents the p0wer-hammer adapted for tube-welding, and made of anyof the usual constructions for that purpose. Secured to the bed of suchhammer is the projecting arm 13, terminating in a vertical arm andguide, 0.

D are the mandrels, one of which may be attached' to either end of themandrelspindle E, and upon this mandrel-spindle are collars a, which areplaced with relation to each other as shown in the drawing, and betweenone pair of these collars the finger 11 engages. This finger is attachedto a lever, F, the lower end of which is pivotally secured to the arm B,

pivotally secured to while the upper end is the leverG, which passesthrough a slot in the guide H, the foot of which is secured to the bedof the hammer. The lever G is provided with a notch, c, to in the guideH.

I is a spring, interposed between the bed of the hammer and thelever F,the oflice of which is to withdraw the mandrel when the notch in thelever G is disengaged from the guide H.

engage with the slot As shown in the drawing, the mandrel-spindleisprovided witha' mandrel at each end and with two sets of collars, sothat such mandrel-spindle may be turned end for end when desired, andrests in the guide upon the top of the arm 0.

' By this construction the weldingmachine described in the aforesaidLetters Patent is rendered much more effective and certain in producingperfect work. e

What I claim 'as my invention is. 1. The combination, with power-hammersand a mandrel for tube-Welding, of a spring constructed to retractthe'mandrel when the latter is released, substantially as described;

2. In combination with power-hammers for welding metallic tubes, thelevers F G and guide H, adapted to lock said mandrel in position,substantially as specified.

3. In a machine for welding metal tubes, and in combination with thepower-hammers. thereof, the arms BO, mandrel D, spindle E, levers F G,guide H, and spring I, the parts being arranged and operatingsubstantially as and for. the purposes set forth.

T. H. ROBERTS.

IVitnesse s:

H. S. SPRAGUE, E. W. Annnnws.

